Fuel filters is the first place to go. There's a cartridge filter inside the cowling many people overlook, and it's built into the high-pressure tank just before the HP pump. Next place to look is compression. If just one cylinder is low, that's a 17% loss of power on that engine.
The Optimax design is essentially a roots-type supercharged 2-stroke motor, using a belt-driven air compressor to force air into the cylinders along with a HPDI fuel injection system.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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